From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: passt.top; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: passt.top; dkim=pass (2048-bit key; secure) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.a=rsa-sha256 header.s=202408 header.b=Edhpe5tv; dkim-atps=neutral Received: from mail.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) by passt.top (Postfix) with ESMTPS id 4593D5A004C for ; Thu, 26 Sep 2024 05:53:07 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gibson.dropbear.id.au; s=202408; t=1727322784; bh=2UP21GAYhpxO0x6RyUk7znCU0FfinT4FBvDzyINALOQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Edhpe5tv44PxPb6X20G0kJLq6Vlp8FmxDT6UZdWkwWe5L6yq6zrF+ZMj0K1m9lOrL UIb9KVpddEpYfwAK7O8uH7q869mUSGXMGXn1rL2peZKmjwUTrvLlb4M+bE3vXJyXjq Yrl/EDzbyFC9JPONMUfdC/9l7cDLXuw6rGWynbM6z6y4ZCFNjxy4ESH990vO3kQ4A2 P9MtKu5inIVJRZp0FXF2YoynzF/ggGwbBSguzTIsbgUCO5t96DbuwKzRt6Yzhw/WMM keVWZv9HRrpD7d3HwB7gRcZUi6nsPs3p5lmYqyjtbBsxbKoZIyqxLO7pByuKszv1b0 TQ+ywONtgpOtg== Received: by gandalf.ozlabs.org (Postfix, from userid 1007) id 4XDfnr5QQ8z4xQg; Thu, 26 Sep 2024 13:53:04 +1000 (AEST) Date: Thu, 26 Sep 2024 13:50:21 +1000 From: David Gibson To: Stefano Brivio Subject: Re: Problematic throughput numbers Message-ID: References: <20240926054552.23969872@elisabeth> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="7lYfALVXnUhAq6/K" Content-Disposition: inline In-Reply-To: <20240926054552.23969872@elisabeth> Message-ID-Hash: 7YQJECZ3VTF6LEG3EKGPP5LVYY6L4WZT X-Message-ID-Hash: 7YQJECZ3VTF6LEG3EKGPP5LVYY6L4WZT X-MailFrom: dgibson@gandalf.ozlabs.org X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header CC: Jon Maloy , passt-dev@passt.top, dgibson@redhat.com, lvivier@redhat.com X-Mailman-Version: 3.3.8 Precedence: list List-Id: Development discussion and patches for passt Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: --7lYfALVXnUhAq6/K Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, Sep 26, 2024 at 05:45:52AM +0200, Stefano Brivio wrote: > On Thu, 26 Sep 2024 11:59:17 +1000 > David Gibson wrote: >=20 > > On Wed, Sep 25, 2024 at 12:36:43PM -0400, Jon Maloy wrote: > > > I made many runs with iperf3 ns->host, and the results are puzzling m= e. > > > Over and over again, I see throughput practically collapse, with a two > > > orders of magnitude decrease. > > > Just to make sure this wasn't something introduced by me, I went back= to the > > > master branch and disabled the SO_PEEK_OFF feature. > > > The result was the same. > > > The below log shows typical run, but it is highly variable. > > > Sometimes almost the whole series is in the 50-70 Gb/s range, and som= etimes > > > almost all in the 100-300 Mb/s range. > > > When I added the kernel fix it didn't seem to make any difference. > > >=20 > > > To me this is really worrying, and should be investigated. =20 > >=20 > > Those numbers are certainly worrying. Like Stefano, though, I have >=20 > ...not...? Oops, yes, that's what I meant. >=20 > > encountered this myself. >=20 --=20 David Gibson (he or they) | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you, not the other way | around. http://www.ozlabs.org/~dgibson --7lYfALVXnUhAq6/K Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEO+dNsU4E3yXUXRK2zQJF27ox2GcFAmb02fwACgkQzQJF27ox 2Gf/RhAAqrNIoPByCSup2VDVxWezri5KxTOWgPapaV4LmHtvhzB2WpPaJJPWnyzb 0aGKswRMoTmZG6GhPjgCiEOiqi+JOxm9iFGtzCT3HWLYyr+zn0eZu7RTaW1wPO7U ACAsYaHMpyahn+2JTIrgMQf/yYeGHS5GQYMnIUeHc4ipc/2vlEqZjey6JabWcgm4 CyZXxpUEMSuLo4XuzJaPQ1j4cE02BvZ8ys0kvQ5fW4nsMsB10erKGtd82oIN961c SeDFvJZ0Hr5VhqFBCbHDbdkm8HN2b3Z/Q4IoREDKH5x+5jbqC+5nz37u5HPfA0FS zaTDA2OOefd9Uo1jkHfH7uR9aHcEkOfXRGf8SKTNjeg3AU7tZqyLLCDscxEKjn31 sJu8maf2TIVF8NkAEhZIZM/XDHNMyGriOa5hhiVWSemQPMVJOS2/7Y6nYt9X7ALm umYwsV5EJzD9+U6hPvMz2bdHFDPfJNTfSNatzMbXdYjnTMvVjhEhNM7zDByVnXYF +GeblnnielcjgubMvAncIdchbfCmAyAOV0LuOAIMx8vCO6fWxaXbFHsrtU5CRim4 aAN+RzGHBKLQkD0bWZHKIlmNgenx7dVhOxdhrY04f2PDxzcbugPkmpm8qkDWTCoe bc7JTlWzTXKayvP5rrRrxKtNqigc5DzZEBmQrzURc53qsXIqjDM= =0nwH -----END PGP SIGNATURE----- --7lYfALVXnUhAq6/K--